Question

Match each verbal statement with the value o fQCR U best matches. Drawing sample scatter plots might help you decide QCR values: -1 0 0.33 0.81 1. a.

Scatterplots
ANSWERED
asked 2021-06-21
Match each verbal statement with the value o fQCR U best matches. Drawing sample scatter plots might help you decide QCR values: -1 0 0.33 0.81 1.

a. Mrs. A Every student who was below average on test 1 was also below average on test 2. Every student who was above average on test 1 was also above average on test 2."

b. Ms. B: "Most of the students who were below average on test 1 were below average on test 2. Similarly, most of the students scoring above average on test 1 were also above average on test 2. There were a few exceptions, but the trend was clear."

c. Mr. C: "Wow, there was really no correlation between test 1 and test 2! half the students who were below average on the first test were also below average on the second test, but half were above average! The same was true for the above average students!"

d. Mr. D: "This is so weird. Every student who was below average on test 1 was above average on test 2, and vice versa."

e. Mr. E: "Of those scoring above average on test 1, about 60% were above average on test 2, but 40$ were below average."

Answers (1)

2021-06-22
aSince on both tests data were the same (below average on test 1 and below average on test 2), this shows positive association and since all students were like that, the QOR for this situation is 1.
bSince on data here is almost similar to that of the first one with some outliers, the QOR for this situation may be close to 1, and among the choices that is 0.81.
cSince data shows no correlation at all, this means on the scatterplot that there are even numbers for both Quadrants J and III and Quadrants II and IV, this means that the QCR is 0.
dSince data shows alternate results for tests 1 and 2 (below average students on test 1 now above average on test 2, which means as there are low values on test 1 and high values on test 2), this must mean that this has a negative association. Hence, QCR is at —1.
eSince there were almost the sameamount of students who were above average to below average, then this must mean in the scatterplot, there are almost the same number of points in Qs I and III to Qs II and IV with the former having a few more points, then this must mean the QCR for this situation is close to 0, and among the choices, this is 0.33
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